Peter Andre's beginning to get sloshed, quaffing butt of Shiraz in swingers' bar (7)
I believe the answer is:
trapeze
'swingers' bar' is the definition.
(bar where acrobats swing)
'peter andre's beginning to get sloshed quaffing butt of shiraz' is the wordplay.
'beginning' says to take the initial letters.
'to get sloshed' indicates an anagram.
'quaffing' means one lot of letters goes inside another (to quaff is to drink or consume).
'butt of' says to take the final letters (the end or 'butt' of the word).
The initial letter of 'andres' is 'a'.
The last letter of 'shiraz' is 'z'.
'peter'+'a'='petera'
'petera' is an anagram of 'trapee'.
'trapee' going around 'z' is 'TRAPEZE'.
'in' is the link.
(Other definitions for trapeze that I've seen before include "Swinging acrobat's bar" , "swingers' bar" , "Acrobatic equipment" , "Horizontal bar as swing for acrobats" , "Six down's swing" .)